After playing for a few hours with monsters having multiple hit points, I gotta say I'm not sure that's a great call.
The game is already _really_ hard, and for non-experts hitting one of the turret or homing monsters with multiple hit points is a guaranteed game over, and that feels really crappy. Part of why I've stuck with the game for so many hours is because I felt like it was possible. I'm not sure I would have felt that way if I was regularly hitting (what appear to the novice to be) game ending moments.
Maybe that should be New Game plus? I'm certainly able to almost beat the game with these multiple-hit monstrosities, but having them be in vanilla is def alienating to people who are still learning the mechanics of a rolly-like.